330 WKST AKKICAN MOLLUSKS STKAIJNS. 



Upon conipai'isoii I can lu'iceive no dirtorciu'c hctweoii (lie foregoiiij;- 

 and Amorican exaini)los. This specios has a rciiiarkahh' uoouiaphical 

 ran<>o. Anion <>• tho l-Moiida Koys and in tho Aiilillcaii rciiion, at Pan- 

 ama, on the wost coast olSonth America, northerly to l-owcr Calil'ornia. 

 and at various places in (he (IiilfoCfalil'ornia. 



I'amily :\1 1' IJICID.K. 



Siihlamily M rKiciN.K. 



Ucniis MUREX l.iiino. 



Suliiivims PHYLLONOTUS Swiiiiisoii. 



69. Phyllonotus losaiiinn I'luimiit/. 



One beach shell; I'orto (Jrande. 



(iomis OCINEBRA l.oiuh. 



70. Mm ex ^Ocinebia) angulaiis Lamarck. 



A sinjile, some\vha( dubious example; Poilo (!r;uitle i^Ius. Nn. 

 125008). 



Sublaniily IM u'riKiN.K. 



(Uniiis PURPURA lUugiiioio. 



71. Purpura haeiiiastoiua l>iiino. 



= /'. luiddtii l.aniarek. 

 ^=7*. Forhfuii DuiiUcr. 



xSunuTous liviuii and beach examples. Fayal (iSFus. Xo. 1251*70); 

 Porto (Jrande (125;U>5. 12i;570); Ashantee (125310, 125320, 125337); 

 8t. Helena (125407). 



From Fayal many specimens, some (uberculated, others without 

 knobs. The I'orto (Irande exami)les were aduKs and juniors of the 

 typical Ibrm ; two of the specinu-ns were (|ni(e lariic, (rianj^ular, and 

 knobby. I'rom Ashantee numerous li\iuii' specimeus of the short- 

 spired* rather triantinlar form, the loulafa t»f Lamarck and narrower 

 examples ^^P. Forhcsii Dunker; others with the sj)ire ol the average 

 height, with two rows of knobs more or less conspicuous, varying in this 

 feature as do the west coast Ameriean colonies of hiscrialis. A single 

 individual <»f (his widely dis(ribnted and mutable form Avas de(eete«l at 

 St. Helena; it is not a characteristic example, having in the white 

 aperture and the inconspicuous transverse ribbing and kn(d)sof(he 

 body whorl a similar phase of \aria(i(Ui from the gener;U aspect of 

 haoKistoDHt, that is exhibited by /'. lihdiirillci Deshaycs -|- /*. Calldorn- 

 fiis lilaiuville of the west coast of South .Vmerica, when » 'omjiared with 

 the oidinary facies of /'. hiscriolis lUaiuville of the same coast to the 

 northward. The St. Helena form is verv close to a varietv of hama- 



